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Mensa-fied best friends and roommates Leonard and Sheldon, physicists who work at the California Institute of Technology, may be able to tell everybody more than they want to know about quantum physics, but getting through most basic social situations, especially ones involving women, totally baffles them. How lucky, then, that babe-alicious waitress/aspiring actress Penny moves in next door. Frequently seen hanging out with Leonard and Sheldon are friends and fellow Caltech scientists Wolowitz and Koothrappali. Will worlds collide? Does Einstein theorize in the woods?
S7, EP13 "The Occupation Recalibration"
Sheldon must learn how to relax when he is forced to take a vacation; Leonard tries to support Penny when she quits her job; Bernadette needs to replace one of Stuart's comic books.
S4, EP3 "The Zazzy Substitution"
When Sheldon searches for an alternative to human companionship, the guys become concerned.
S4, EP22 "The Wildebeest Implementation"
Raj tries to cure his social anxiety; Penny spies on Leonard and his girlfriend through Bernadette.
S4, EP23 "The Engagement Reaction"
Howard's mom winds up in the hospital after hearing news of her son's engagement to Bernadette.
S4, EP21 "The Agreement Dissection"
Priya dissects the roommate agreement; the ladies take Sheldon dancing.
S4, EP20 "The Herb Garden Germination"
Amy and Sheldon spread gossip as part of an experiment; Howard decides to take a big step in his relationship with Bernadette.
S4, EP19 "The Zarnecki Incursion"
The guys try to figure out who hacked Sheldon's online-game account.
S4, EP18 "The Prestidigitation Approximation"
Leonard has to choose between Penny and his new girlfriend, Priya; Howard's magic trick drives Sheldon crazy.